[metapost] rt does not work with drawarrow
Aditya Mahajan
adityam at umich.edu
Mon Mar 12 17:57:40 CET 2007
Hi,
I want to draw an arrow from a point to a line such that the tip of
the arrow just touches the edge of the line. By default the tip of the
arrow moves a bit into the line.
I tried rt operator with linecap = butt, which gives the desired
behaviour for lines, but not for arrows. Any hints on how to modify
the definition of arrowhead so that rt/left/top/down operators are
honored, or any other way to achieve the desired effect, without
manually adjusting the length of the line segment?
Here is my attempt:
beginfig(1)
numeric u ; u := 1cm;
linecap := butt ;
pair a, b, c;
a := origin;
b := (2u,0) ;
rt c = (2u,0) ;
path line ; line := (2u,u) -- (2u,-u) ;
draw line ;
draw a--b withcolor red ;
draw (a--c) shifted (0,0.5u) withcolor red ;
currentpicture := currentpicture shifted (-4u,0) ;
draw line ;
drawarrow a--b withcolor red ;
drawarrow (a--c) shifted (0,0.5u) withcolor red ;
setbounds currentpicture to (bbox currentpicture) scaled 1.1;
endfig;
end;
Thanks,
Aditya
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